Current Sensor Handles Sub-5A Apps

Allegro MicroSystems, introduces its first fully integrated, giant magneto-resistive (GMR) based current sensor IC with ultra-high sensitivity for applications that require less than 5A current sensing. The IC incorporates GMR technology that is 25 times more sensitive than traditional Hall-effect sensor ICs to sense the magnetic field generated by the current flowing through the low resistance, integrated primary conductor.

 

The device senses very small currents with 1 mA resolution, exhibits a series resistance of 1 mΩ, and its QFN package measures 3 mm x 3 mm. Applications include handheld and laptop adaptor chargers, radios and walkie talkies, IoT load detection, small surveillance, and other motor control applications.

Fierce AI Week

Register today for Fierce AI Week - a free virtual event | August 10-12

Advances in AI and Machine Learning are adding an unprecedented level of intelligence to everything through capabilities such as speech processing and image & facial recognition. An essential event for design engineers and AI professionals, Engineering AI sessions during Fierce AI Week explore some of the most innovative real-world applications today, the technological advances that are accelerating adoption of AI and Machine Learning, and what the future holds for this game-changing technology.

 

The analog output provides a low-noise high-speed signal, which is proportional to the current flowing through the primary conductor. The full-scale bandwidth is 1 MHz and the response time of the device is typically 535 ns. The ACS70331 is offered in four factory-programmed sensitivity and offset levels to optimize performance over the desired current measurement range. The differential configuration of the GMR elements, relative to the integrated current conductor, provides significant rejection of stray magnetic fields, resulting in stable operation even in magnetically noisy environments.

 

Allegro’s ACS70331 current sensor IC operates from a single 3.3 V power supply and is qualified over the full commercial temperature range of –40°C to +85°C. Pricing is $0.53 each/1,000. Starved for more information? Then download a copy of the ACS70331 datasheet.

 

Allegro MicroSystems

Worcester, MA

508-853-5000

http://www.allegromicro.com

Suggested Articles

Survey of 30 chipmakers offers a good sign for research and development of self-driving vehicles, analyst says

Research dollars for AV are expected to remain, if slowed, especially for companies that see self-driving as a key to their success

Hydrogen refueling stations are limited in the U.S., restricting interest in use of fuel cell electric cars